General discussion

h5p.json got, according to H5P specifications, the following properties:

Mandatory:
title, language, machineName, preloadedDependencies, embedTypes

Option:
contentType, description, author, license, dynamicDependencies, width, height, metaKeywords, metaDescription

But I got the following error if I does not have mainLibrary defined:
"The required property mainLibrary is missing from h5p.json"

(By the way, the example Boardgame does not have this property..)

Enabled H5P editor and the result is WSOD on create content --> H5P

Having a javascript in library with typical jQuery.name-packed.js causes error. Rename javascript to something without dot is working, example: jQuery_name-packed.js